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Dragon goby is brackish but can adapt to freshwater. I would suggest not getting one. Other than that your stocking doesn't sound too bad. Just make sure to have the corys and ottos in schools of at least 6 preferably more.

I would also add a school of small tetras or harlequin rasboras otherwise I think the top of your tank will be lacking a bit.

Thanks for the advice!!!

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Sorry for this overload of questions, but thanks so much for the last few replies!

As far as the goby, I have already got him and have had him for about eight months, but I did not know he needed brackish water. I supposed I will try to get him a tank of his own when I upgrade and possibly get a couple more fish of some sort to go with him. I assume that "black fin sharks" would cause too much competition for him? How about rubber lipped plecos, do they prefer brackish or regular, groups or single? And since I will be getting a tank just for my Goby, are they best alone or with others of their kind?

As for the plants, thanks for the suggestions, I think I will back away from the idea of a fully planted bottom and try to come up with some ideas for plants to scatter about a bit for what will now become two separate tanks.

Homemadepopcorn: thanks and what did you mean by you don't think a uv light will work?

ryann: thanks for the advice, I have three albino corys now, but I plan to get at least three more once I upgrade my current tank to a 50

wijnands: What are some brackish middle or top dwellers? Will a 50 be big enough for the corys and ottos not to have too much food/space competition? Thanks for the planting and fish advice as well as the link. The corys, ottos, and goby interest me the most so I will be designing my two tanks around their needs.